Mule: How to use until successfull processor for service calls - mule

Question

Please help me on this logic. I have to call the service and get the response back.If the service is down or something have to retry 3 times and once exhausted need to log in DLQ.I'm using until successful processor.For success scenario i'm getting only null payload in logger.But i tried keeping the HTTP outbound end point without until successfull able to get the response from the service. Please find my xml config.
<flow name="Flow" doc:name="eFlow" tracking:enable-default-events="true">
<wmq:inbound-endpoint queue="InputQ" tracking:enable-default-events="true" connector ref="WMQ_Connector" doc:name="connector">
<wmq:transaction action="NONE"/>
</wmq:inbound-endpoint>
<mulexml:dom-to-xml-transformer></mulexml:dom-to-xml-transformer>
<set-session-variable variableName="originalPayload" value="#[payload]" doc:name="Store_Payload"/>
<choice tracking:enable-default-events="true" doc:name="Choice">
<when expression="#[xpath('fn:local-name(/root/*[2])') == 'Master']">
<data-mapper:transform config-ref="Master_grf" doc:name="Master"/>
</when>
<when expression="#[xpath('fn:local-name(/root/*[2])') == 'Request']">
<data-mapper:transform config-ref="Request_grf" doc:name="Bulk"/>
</when>
<otherwise>
<scripting:component doc:name="Throw_Exception">
<scripting:script engine="Groovy"><![CDATA[throw new IllegalArgumentException ('requests invalid') ]]>
</otherwise>
</choice>
<mulexml:dom-to-xml-transformer></mulexml:dom-to-xml-transformer>
<flow-ref name="Invoke_Service" doc:name="Flow Reference"/>
</flow>
<flow name="Invoke_Service" doc:name="Invoke_Service" tracking:enable-default-events="true">
<cxf:jaxws-client enableMuleSoapHeaders="true" doc:name="SOAP" operation="Request" serviceClass="com.valid.ICase"/>
<until-successful objectStore-ref="objectStore" maxRetries="3" secondsBetweenRetries="2" deadLetterQueue-ref="VM" doc:name="UntilSuccessful_SymboticService">
<http:outbound-endpoint exchange-pattern="request-response" method="POST" doc:name="HTTP" address="http://localhost:1112/symbotic"/>
</until-successful>
<byte-array-to-string-transformer doc:name="Byte Array to String"/>
<logger message="**********success***Payload: #[payload]*****" level="INFO" doc:name="Logger"/>
But incase of failure scenario until success retry 3 times ( works fine). I have tried request reply processor inside until also transactional processor. It is not working. Using Mule version 3.4.kindly suggest me.
Retried the same with request -reply processor as per the suggestion
<flow name="Flow" doc:name="eFlow" tracking:enable-default-events="true">
<wmq:inbound-endpoint queue="InputQ" tracking:enable-default-events="true" connector- ref="WMQ_Connector" doc:name="connector">
<wmq:transaction action="NONE"/>
</wmq:inbound-endpoint>
<mulexml:dom-to-xml-transformer></mulexml:dom-to-xml-transformer>
<set-session-variable variableName="originalPayload" value="#[payload]" doc:name="Store_Payload"/>
<choice tracking:enable-default-events="true" doc:name="Choice">
<when expression="#[xpath('fn:local-name(/root/*[2])') == 'Master']">
<data-mapper:transform config-ref="Master_grf" doc:name="Master"/>
</when>
<when expression="#[xpath('fn:local-name(/root/*[2])') == 'Request']">
<data-mapper:transform config-ref="Request_grf" doc:name="Bulk"/>
</when>
<otherwise>
<scripting:component doc:name="Throw_Exception">
<scripting:script engine="Groovy"><![CDATA[throw new IllegalArgumentException('requests other then Master andRequest') ]]>
</otherwise>
</choice>
<mulexml:dom-to-xml-transformer></mulexml:dom-to-xml-transformer>
<request-reply timeout="10000">
<vm:outbound-endpoint path="request"/>
<vm:inbound-endpoint path="reply"/>
</request-reply>
<byte-array-to-string-transformer doc:name="Byte Array to String"/>
<logger message="**********success***Payload: #[payload]*****" level="INFO" doc:name="Logger"/>
</flow>
<flow name="Invoke_Service" doc:name="Invoke_Service" tracking:enable-default-events="true">
<vm:inbound-endpoint path="request" doc:name="VM"/>
<cxf:jaxws-client enableMuleSoapHeaders="true" doc:name="SOAP" operation="Request" serviceClass="com.valid.ICase"/>
<until-successful objectStore-ref="objectStore" maxRetries="3" secondsBetweenRetries="2" deadLetterQueue-ref="VM" doc:name="UntilSuccessful_Service">
<http:outbound-endpoint exchange-pattern="request-response" method="POST" doc:name="HTTP" address="http://localhost:1112/symbotic"/>
</until-successful>
</flow>
Even then getting the null payload. Kindly suggest is this is the way your were directing me. Please correct me if im wrong.

Answer 1

until-successful is an asynchronous processor. It does not return response from service call.
Success or failure are defined as:
If the child message processor throws an exception, this is a failure.
If the child message processor does not return a message (e.g. is a one-way endpoint), this is a success.
If a 'failure expression' (see below) has been configured, the return message is evaluated against this expression to determine failure or not.
Otherwise:
If the child message processor returns a message that contains an exception payload, this is a failure.
If the child message processor returns a message that does not contain an exception payload, this is a success.
http://www.mulesoft.org/documentation/display/current/Routing+Message+Processors#RoutingMessageProcessors-UntilSuccessful